CN101939897B - Linear motor - Google Patents
Linear motor Download PDFInfo
- Publication number
- CN101939897B CN101939897B CN200980104631.5A CN200980104631A CN101939897B CN 101939897 B CN101939897 B CN 101939897B CN 200980104631 A CN200980104631 A CN 200980104631A CN 101939897 B CN101939897 B CN 101939897B
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- China
- Prior art keywords
- coil
- formed body
- linear motor
- bobbin
- retainer
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-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
- H02K41/03—Synchronous motors; Motors moving step by step; Reluctance motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
- H02K9/223—Heat bridges
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/325—Windings characterised by the shape, form or construction of the insulation for windings on salient poles, such as claw-shaped poles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/52—Fastening salient pole windings or connections thereto
- H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
- H02K3/522—Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles
Abstract
Provided is a novel linear motor, which can generate a high thrust although made compact. The linear motor comprises a field magnet (2) having N-poles and S-poles arrayed alternately in a direction for rectilinear motions, and an armature (9) for rectilinear motions relative to the field magnet (2). The armature (9) includes a plurality of coils (3) opposed through clearances to the field magnet (2), a core (11) having a plurality of comb teeth (11a to 11c) inserted individually into the coils (3), and bobbins (14) interposed between the individual coils (3) and the individual comb teeth (11a to 11c). The bobbins (14) are made of an insulator, and have a thermal conductivity of 2W/(mK) or higher. The insulating material having the thermal conductivity of 2W/(mK) or higher is used for the bobbins (14), and the thermal conductivity can be improved to ten times or higher than that of bobbins made of insulating paper. Thus, the heat to be generated from the coils (3) can be effectively released to the core (11).
Description
Technical field
The magnetic field that the present invention relates to produce by exciting magnet obtains for carrying out the linear motor of straight-line thrust with the electric current that flows through coil.
Background technology
Linear motor be divided into across the gap tabular exciting magnet elongated with shape relative to the linear motor of platypelloid type and the linear motor of the exciting magnet of armature encircles rod (axle) shape of tubular bar type (also referred to as axle type) around.
In the linear motor of platypelloid type, armature carries out rectilinear motion relatively with respect to the exciting magnet that forms elongated plate-like.Exciting magnet is the parts that multiple flat magnet are arranged to be alternately formed with the mode of the N utmost point and the S utmost point on surface.Armature have across magnetic gap relative with exciting magnet to U, V, the coil of W phase.When three-phase alternating current flows through coil, the magnetic field producing by magnet and the electric current that flows through coil, produce and be used for carrying out straight-line thrust (for example, with reference to patent documentation 1).In order to obtain the linear motor of high thrust, the known linear motor that has the platypelloid type that inserts band iron core unshakable in one's determination in coil.
On the other hand, in the linear motor of bar type, the bar (axle) that the armature of encircles rod tubular around replaces excitation with respect to the N utmost point and the S utmost point carries out rectilinear motion relatively.Armature has U, the V around magnetic gap is wound on exciting magnet, the coil of W phase.The coil of U, V, W phase is arranged along the axis direction of bar.When the three-phase alternating current of U, V, W phase flows through coil, the magnetic field producing by magnet and the electric current that flows through coil, produce and be used for carrying out straight-line thrust (for example, with reference to patent documentation 2).
For linear motor, require compact and can produce high thrust.At this, the magnetic flux density B that the thrust of linear motor and magnet produce and flow through electric current I long-pending proportional of coil.Therefore,, by increasing the magnetic flux density B of magnet or the electric current I that coil is flow through in increase, can increase thrust.In order to increase the magnetic flux density of magnet, in the history of linear motor, carried out ferrite lattice to change into the way of rare earth element magnet.But the situation of the magnetic flux density of increase magnet is restricted, is difficult to further increase magnetic flux density B.
The electric current I that coil is flow through in increase also can increase thrust.But increasing the electric current flow through coil need to carry out on the basis of coil heating preventing.This is to have resistance because of the wire due to coil, and therefore large electric current can produce square proportional Joule heat to electric current while flowing through coil.When due to Joule heat, the temperature of coil continues to rise, the insulating coating of wire dissolves, and wire no longer insulation each other.When wire no longer insulate each other, the number of turn that is equal to coil reduces, thereby declines to the thrust of the proportional linear motor of the number of turn of coil.Therefore, flow through the temperature that the current limited of coil is dissolved in the insulating coating that does not make wire.The situation that can prevent coil heating is also closely related with this situation of thrust can increasing motor producing.
In order to prevent coil heating, also using gold, silver or resistance is the way that the material of zero superconductor replaces copper.Resistance hour, coil no longer generates heat, and therefore can make large electric current flow through coil, thereby can increase the thrust of linear motor.
In addition, in order to prevent coil heating, form fin covering the housing of coil or be inserted on the iron core in coil, heat is become separated in flight atmosphere from fin.If the heat that can make coil produce is become separated in flight, even if the caloric value of coil self is large, also can prevent that the temperature of coil from rising.
Patent documentation 1: TOHKEMY 2006-074975 communique
Patent documentation 2: TOHKEMY 2002-354780 communique
Yet the method for using gold or superconductor material to replace copper is difficult to realize aspect cost.And, on the housing of coil or iron core, form fin and the method that heat is become separated in flight need to structurally be tried every possible means, and cannot further improve cooling effectiveness.
Summary of the invention
Therefore, the object of the invention is to, a kind of compactness is provided and can produces the novel linear motor of higher thrust.
In order to solve above-mentioned problem, the magnetic field that the linear motor of a first aspect of the present invention produces by exciting magnet and the electric current that flows through coil, obtain for making coil relatively carry out straight-line thrust with respect to exciting magnet, it possesses: the exciting magnet of the N utmost point and S utmost point alternative arrangement on described linear movement direction; The armature with a plurality of coils, iron core, bobbin, described a plurality of coil across gap relative with described exciting magnet to, described iron core has a plurality of broach that are inserted into respectively in described a plurality of coil, described bobbin is folded between each coil and each broach, and described bobbin is that insulator and its thermal conductivity are more than 2W/ (mK).
The magnetic field that the linear motor of a second aspect of the present invention produces by exciting magnet and the electric current that flows through coil, obtain for making coil relatively carry out straight-line thrust with respect to exciting magnet, it possesses: the exciting magnet of the N utmost point and S utmost point alternative arrangement on described linear movement direction; The armature with a plurality of coils, iron core, formed body, described a plurality of coil across gap relative with described exciting magnet to, described iron core has a plurality of broach that are inserted into respectively in described a plurality of coil, described formed body covers described a plurality of coils and by described a plurality of coils and described combination unshakable in one's determination, described formed body is that insulator and its thermal conductivity are more than 2W/ (mK).
The magnetic field that the linear motor of a third aspect of the present invention produces by exciting magnet and the electric current that flows through coil, obtain for making coil relatively carry out straight-line thrust with respect to exciting magnet, it possesses: the exciting magnet of the N utmost point and S utmost point alternative arrangement on described linear movement direction; The armature with a plurality of coils, formed body, described a plurality of coils surround around described exciting magnet, and described formed body covers described a plurality of coils, and described formed body is that insulator and its thermal conductivity are more than 2W/ (mK).
The magnetic field that the linear motor of a fourth aspect of the present invention produces by exciting magnet and the electric current that flows through coil, obtain for making coil relatively carry out straight-line thrust with respect to exciting magnet, it possesses: the exciting magnet of the N utmost point and S utmost point alternative arrangement on described linear movement direction; The armature with a plurality of coils, coil retainer, described a plurality of coil is around gap is arranged on described exciting magnet, described coil retainer is used for keeping described a plurality of coil, described coil retainer is included in the retainer main part that runs through described a plurality of coil on described linear movement direction and extend and is folded in a plurality of spacer portion between adjacent coil, and described coil retainer is that insulator and its thermal conductivity are more than 2W/ (mK).
It is basis that the linear motor of a fifth aspect of the present invention be take first aspect to the linear motor described in either side in fourth aspect, it is characterized in that, described bobbin, described coil retainer or described formed body are in resin, to mix a plurality of metal oxide particles with the insulating properties of different average grain diameters to form.
The linear motor that the linear motor of a sixth aspect of the present invention be take described in the 5th aspect is basis, it is characterized in that, described bobbin, described coil retainer or described formed body are by carrying out injection molding forming and manufacture being mixed with the thermoplastic resin of the metal oxide particle of described insulating properties.
The linear motor that the linear motor of a seventh aspect of the present invention be take described in the 5th aspect is basis, it is characterized in that, described formed body is that the castable that flows into mould by making to be mixed with the thermosetting resin of the metal oxide particle of described insulating properties is manufactured.
The linear motor of a eighth aspect of the present invention be take the linear motor described in either side in first aspect to the seven aspects and, as basis, be it is characterized in that, the coefficient of linear expansion of described bobbin, described coil retainer or described formed body is set as 10 * 10
-6above 30 * 10
-6below.
Invention effect
In the linear motor of platypelloid type, a system of becoming separated in flight as the heat that makes to produce from coil, has the system of becoming separated in flight to iron core via bobbin from coil.Bobbin is the insulator being folded between coil and broach unshakable in one's determination, plays the effect that makes coil and broach insulation unshakable in one's determination.According to a first aspect of the invention, because bobbin is used thermal conductivity for the above insulating material of 2W/ (mK), therefore the bobbin made of paper with insulation compared, and thermal conductivity can be brought up to more than ten times, thereby can be made efficiently the heat producing from coil become separated in flight to iron core.Therefore, can improve the thrust of the electric current or the linear motor that flow through coil.
In the linear motor of platypelloid type, another system of becoming separated in flight as the heat that makes to produce from coil, has the system of becoming separated in flight to atmosphere via formed body from coil.Formed body plays and covers coil and by the effect of coil and combination unshakable in one's determination.According to a second aspect of the invention, because formed body is used thermal conductivity for the above insulating material of 2W/ (mK), therefore compare with resinous formed body, thermal conductivity can be brought up to more than ten times, thereby can make efficiently the heat producing from coil become separated in flight to atmosphere.Therefore, can improve the thrust of the electric current or the linear motor that flow through coil.
In the linear motor of bar type, a system of becoming separated in flight as the heat that makes to produce from coil, has the system of becoming separated in flight to atmosphere via formed body from coil.Formed body plays and covers the effect of coil or as the effect of housing.According to a third aspect of the invention we, because formed body is used thermal conductivity for the above insulating material of 2W/ (mK), therefore compare with resinous formed body, thermal conductivity can be brought up to more than ten times, thereby can make efficiently the heat producing from coil become separated in flight to atmosphere.Therefore, can improve the thrust of the electric current or the linear motor that flow through coil.
In the linear motor of bar type, a system of becoming separated in flight as the heat that makes to produce from coil, has the system of becoming separated in flight to coil retainer from coil.Coil retainer plays hold-in winding and makes the effect insulated from each other of adjacent coil.According to a forth aspect of the invention, because coil retainer is used thermal conductivity for the above insulating material of 2W/ (mK), therefore compare with resinous coil retainer, thermal conductivity can be brought up to more than ten times, thereby can be made efficiently the heat producing from coil become separated in flight to coil retainer.Therefore, can improve the thrust of the electric current or the linear motor that flow through coil.
Therefore according to a fifth aspect of the invention, owing to mixing a plurality of metal oxide particles with the insulating properties of different average grain diameters in resin, can utilize the gap of resin each other of metal oxide particle in the large footpath of metal oxide particle landfill of path.Owing to carrying out transferring heat via the metal oxide particle that has improved filling rate, therefore can improve thermal conductivity.
According to a sixth aspect of the invention, can produce in a large number bobbin, coil retainer or formed body with high dimensional accuracy.
According to a seventh aspect of the invention, owing to can reducing the cost of mould, therefore can manufacture at an easy rate body.
According to an eighth aspect of the invention, the coefficient of linear expansion of bobbin, coil retainer or formed body and resin (120 * 10
-6) coefficient of linear expansion compare few one, approach steel (11～13 * 10
-6), copper (19～20 * 10
-6), aluminium (22～23 * 10
-6) etc. the coefficient of linear expansion of metal.The elongation of bobbin, coil retainer or formed body owing to can make temperature increase time and coil, elongation unshakable in one's determination about equally, so can keep their contact.Therefore, can prevent because temperature rises between them vacuum gap or air layer and the situation that is difficult to heat conduction.
Accompanying drawing explanation
Fig. 1 is the stereogram of the platypelloid type linear motor of the first execution mode of the present invention.
Fig. 2 is the front view of the linear motor of Fig. 1.
Fig. 3 is the vertical view of exciting magnet.
Fig. 4 is the stereogram of armature.
Fig. 5 is the cutaway view along moving direction of armature.
Fig. 6 is the stereogram of the armature of topsy-turvydom.
Fig. 7 is the stereogram of bobbin.
Fig. 8 is the framework using in castable.
Fig. 9 is the figure that the particle diameter of metal oxide and the relation of quality % are shown.
Figure 10 is the schematic diagram of the amplification view of bobbin.
Figure 11 is the stereogram of linear motor of the bar type of the second execution mode of the present invention.
Figure 12 is the figure that the magnet of linear motor and the position relationship of coil are shown.
Figure 13 is the stereogram that the coil unit being kept by coil retainer is shown.
Figure 14 is the details drawing (in figure, (A) illustrates front view, and cutaway view (B) is shown) of coil retainer.
Figure 15 illustrates the figure (when (A) represents that current value is I * 1 times in figure, while (B) representing that current value is I * 1.15 times, while (C) representing that current value is I * 1.63 times) that flows through the electric current of coil and the relation of coil temperature.
Symbol description:
2 exciting magnets
3 coils
9 armatures
11 iron cores
11a～11c broach
14 bobbins
16 formed bodies
21 bars
22 formed bodies (housing)
23 exciting magnets
24 coils
25 coil retainers
Embodiment
Based on accompanying drawing, describe the linear motor of one embodiment of the present invention in detail.Fig. 1 and Fig. 2 illustrate the platypelloid type linear motor of the first execution mode of the present invention.Fig. 1 illustrates stereogram, and Fig. 2 illustrates front view.The linear motor of this execution mode is the actuator of an axle, for the moving bodys such as workbench are moved axially along one.The matrix 1 of elongated extension is provided with tabular exciting magnet 2 as the stator of linear motor.The coil 3 of the armature 9 of linear motor relative with exciting magnet 2 to.By flowing through the electric current of coil 3 of armature 9 and the effect in the magnetic field of exciting magnet 2 produces thrust, thereby make armature 9 relatively carry out rectilinear motion with respect to exciting magnet 2.
As shown in the front view of Fig. 2, between exciting magnet 2 and armature 9, magnetic gap g is set.When armature 9 moves with respect to exciting magnet 2, this gap g also remains constant.
As shown in Figure 1, matrix 1 is along the elongated extension of linear movement direction of armature 9.Matrix 1 has the bottom plate 1a of rectangle and is arranged on the 1b of pair of sidewalls portion on the Width both ends of bottom plate 1a.The track 5 of line slideway is installed respectively on the upper surface of the 1b of pair of sidewalls portion.Track 5 elongated extension in the roughly whole length of the length direction of side wall portion 1b.The rolling element such as ball, roller that is formed with the coaster 6 of line slideway along track 5 on the outer peripheral face of track 5 carries out the rolling element raceway groove of rolling movement.
The upper surface of the bottom plate 1a of matrix 1 is provided with the exciting magnet 2 that the N utmost point and the S utmost point alternately form on the linear movement direction of armature 9.As shown in Figure 3, exciting magnet 2 is the tabular magnet 19 of multiple parallelogram to be arranged in to the parts of row.On each tabular magnet 19 along direction (with the direction of paper quadrature in figure) the excitation N utmost point and the S utmost point with the length direction quadrature of exciting magnet 2.The surperficial magnetic pole of tabular magnet 19 and the magnetic pole of adjacent tabular magnet 19 are contrary magnetic pole, thereby alternately form the N utmost point and the S utmost point along the length direction of exciting magnet 2.
As shown in Figure 1, on pair of right and left track 5, be separately installed with the coaster 6 of the line slideway that can slide.Left and right coaster 6 on across the combination top board 7 that has a shape.On lower surface in conjunction with top board 7, be hung with armature 9.
In conjunction with top board 7, there is the top 7a of the elongated extension of broad ways and a pair of 7b of foot that is arranged on the Width two ends of top 7a and hangs down downwards.The lower end of the 7b of foot is provided with the coaster 6 of line slideway.Armature 9 is installed on the lower surface of top 7a.On the upper surface of top 7a, moving body is installed.
Fig. 4 and Fig. 5 illustrate the details drawing of armature 9.Armature 9 possesses: the three-phase coil 3 (3a, 3b, 3c) of facing mutually with exciting magnet 2; The iron core 11 in the magnetic field producing for intensifier coil 3; The heat sink 12 of becoming separated in flight to atmosphere for the heat that makes to produce from coil 3.
The electric current that flows through coil 3 is controlled by not shown control device.The line detecting element that detects armature 6 positions is installed on matrix 1.Control device feeds back positional information and the velocity information of the detected armature 9 of line detecting element, calculates the residual quantity with desired value, so that the position of armature 9 and speed approach the mode of desired value, makes electric current flow through three- phase coil 3a, 3b, 3c.
Unshakable in one's determination 11 have along the tabular base plate 11d of the elongated extension of orientation of a plurality of coils 3 and from base plate 11d respectively towards interior side-prominent a plurality of broach 11a, 11b, the 11c of three- phase coil 3a, 3b, 3c.The upper surface of base plate 11d contacts with the lower surface of heat sink 12.A plurality of broach 11a, 11b, 11c give prominence to along the direction with base plate 11d quadrature.Unshakable in one's determination 11 material is such as magnetics such as silicon steel.
Fig. 6 illustrates the stereogram (cutting coil 3 open along the moving direction of armature 9 for the ease of observing bobbin 14) of the armature 9 of topsy-turvydom.Coil 3 is by the Wire-wound that covers dielectric film around copper parts circlewise.Wire is guaranteed insulation by the dielectric film of outer side covers each other.Yet, when coil 3 is inserted into broach 11a～11c, the situation of considering to have coil 3 and the broach 11a～11c dielectric film by wire to insulate.This is because dielectric film that can damage wires during direct winfing coil 3 on broach 11a～11c, thus broach 11a～11c and wire conducting.Therefore, direct winfing coil on broach 11a～11c not, and between broach 11a～11c and coil 3 bobbin 14 of sandwiched for making to insulate between them.
Fig. 7 illustrates the stereogram of bobbin 14.Bobbin 14 consists of the lip portions 14b that surrounds the bobbin main body 14a of broach frame shape around and be arranged on the end of axis direction of bobbin main body 14a.Lip portions 14b is folded between the end face of axis direction of coil 3 and unshakable in one's determination 11 base plate 11d and makes to insulate between them.Under insulation object, used the insulating paper that is called as Nomex (registered trade mark) paper in the past.It is to have the insulating capacity of several kilovolts, thin and paper that insulating capacity is good with the thickness of tens μ m.While using insulating paper, at the surrounding of the broach 11a～11c insulating paper of reeling from level to level, and at surrounding's coiling coil 3 of insulating paper.Yet, if not handwork cannot be wound on insulating paper around broach 11a～11c.Due to the operation trouble of coiling insulating paper, therefore replace insulating paper and use the bobbin 14 of the formed products around all standing broach 11a～11c.After surrounding's coiling coil 3 of bobbin 14, bobbin 14 is embedded in to broach.By bobbin 14 is formed to insulator, can be by coil 3 and broach 11a～11c insulation.
Owing to being formed products, so the minimum thickness with 0.2mm, 0.3mm, 0.5mm etc. of bobbin 14.During by stable on heating liquid crystal polymer (thermal conductivity is 0.2W/ (mK) left and right) injection molding forming bobbin 14, on the low basis of thermal conductivity, increase thickness, so thermal impedance increases.When the thermal impedance of bobbin 14 increases, cannot make the heat of coil 3 become separated in flight to unshakable in one's determination 11.Therefore, bobbin 14 is used thermal conductivity for the above material of above, the preferred 6W/ (mK) of 2W/ (mK).
The material of bobbin 14 is to take the moulding material that the metal oxide particle of insulating properties forms in thermoplastic resin as packing material is blended in.Bobbin 14 is by carrying out injection molding forming and manufacture being mixed with the thermoplastic resin of metal oxide particle.
As shown in Figure 9, metal oxide particle be by be classified into average grain diameter be 0.5～2 μ m scope path metal oxide particle B and to be classified into average grain diameter be that the metal oxide particle A in the large footpath of 5～20 μ m scopes mixes.The particle diameter of metal oxide particle B be metal oxide particle A particle diameter approximately 1/10.Also can in metal oxide particle B, mix again the metal oxide particle C of approximately 1/10 particle diameter.It is below 40% that the overlapping part d of distribution of metal oxide particle A and metal oxide particle B accounts for whole quality %, preferably below 1%.Be 1% when following, the distribution of the distribution of metal oxide particle A and metal oxide particle B is almost no longer overlapping, and whole distribution curve is discontinuous.
While so setting the average grain diameter of metal oxide particle A, B, as shown in figure 10, the gap of the metal oxide particle A in large footpath resin is each other by the metal oxide particle B landfill of path.Therefore, can improve the filling rate of metal oxide particle A, B.Due to can be via the metal oxide particle A, the B transferring heat that have improved filling rate, so thermal conductivity rises.At this, when the particle diameter of metal oxide is less than 0.5 μ m, the caking state of particle (a plurality of particle image doughs become bulk like that) is remarkable, dispersion efficiency variation, and result thermal conductivity variation, therefore not preferred.And, when particle diameter is greater than 20 μ m, damage thin molded property, can only make the parts that thickness is large.Specifically, because the thickness below 1mm is difficult to be shaped, so thermal resistance resistance is large, not preferred.Make the thickness of the parts that heat passes through must be thin.No matter how good heat conduction is, as long as the thickness of material is large, result thermal impedance just increases, thereby radiating effect is impaired.
Kind as the metal oxide particle of insulating properties, can there are aluminium oxide (Al
2o
3), silicon dioxide (SiO
2), zirconia (ZrO
2), titanium oxide (TiO
2), magnesium oxide (MgO), mullite (3Al
2o
32SiO
2), zircon (ZrO especially
2siO
2), cordierite (2MgO2Al
2o
35SiO
2), manganese oxide (MnO
2), iron oxide (Fe
2o
3), cobalt oxide (CoO) etc., but be not limited to described metal oxide.While considering the heat radiation that improves linear motor, in the metal oxide particle of insulating properties, can utilize the above particle of thermal conductivity 1W/ (mK), for example silicon nitride (Si
3n
4), carborundum (SiC), boron nitride (BN), aluminium nitride (AlN) etc.
Metal oxide particle is at least more than 50% with respect to the capacity % of moulding material whole volume, preferably 55～65% scope.When being less than 50 capacity %, thermal conductivity sharply declines.When surpassing 50 capacity %, thermal conductivity starts to rise, but 55% to 65% scope is to be applicable to the mobility of injection molding forming and the scope of this two aspect of thermal conductivity.While surpassing 65 capacity %, shaping mobility sharply declines, and cannot carry out thin moldedly, can cause the complicated obstacles such as 3D shape that cannot be shaped, not preferred.
So-called thermoplastic resin refers to synthetic resin that can melt-shaping, as object lesson, there are for example from non-liquid crystal liquid crystal property semi-aromatic polyester, the non-liquid crystalline polyesters such as non-liquid crystal liquid crystal property Wholly aromatic polyester, liquid crystal polymer (liquid crystalline polyester, liquid crystalline polyester acid amides etc.), Merlon, fatty polyamide, aliphatic-aromatic polyamide, the polyamide such as fully aromatic polyamide, polyformaldehyde, polyimides, polyamide, polybenzimidazoles, polyketone, polyether-ether-ketone, polyether-ketone, polyether sulfone, Polyetherimide, Noryl, polysulfones, poly arylidene thio-ester, polypropylene, the olefin polymer of polyethylene etc., the olefin copolymer of ethylene/propene copolymer etc., ABS, AS, the styrene based copolymers such as polystyrene, methacrylic resin, polyesterether elastomer, polyester elastomer, the mixture of one or more that select in the elastomers such as polyamide elastomer, but conventionally preferably use 6 nylon, PPS, LCP or PET.
The electrical insulating property of thermoplastic resin is preferably specific impedance 10
12more than Ω cm, more than insulation breakdown intensity 10kV/mm, and its thermal conductivity is preferably minimum 1W/ (mK) to maximum 20W/ (mK) left and right.
By the thermoplastic resin that is mixed with metal oxide particle to above record, carry out injection molding forming, it is more than 2W/ (mK) can manufacturing thermal conductivity, for example 6W/ (mK), 8W/ (mK), 10W/ (mK) ..., maximum 20W/ (mK) bobbin 14.
As shown in Figure 5, the bobbin 14 that is wound with coil 3a～3c is fixed on by binding agent on broach 11a～11c of unshakable in one's determination 11.Yet, while being only binding agent, in conjunction with unstable, cannot obtain bobbin 14 to be completely fixed in be sure oing on unshakable in one's determination 11.If coil 3 is insufficient with unshakable in one's determination 11 bonding,, when electric current flows through coil 3, can produce coil 3 with respect to 11 problems that move unshakable in one's determination.Therefore, after bobbin 14 is bonded on unshakable in one's determination 11, by integrally formed unshakable in one's determination 11, the bobbin 14 of formed body 16, coil 3.Be formed body 16 of coil 3 covers and does not expose.For coil 3 being fixed on reliably on unshakable in one's determination 11, and formed body 16 needs mechanical strength.And this formed body 16 is necessary for insulator.This is because electric current is likely exciting magnet 2 transmission from coil 3 to conductor, and electric current is likely roundabout and be delivered to the front end of broach 11a～11c bobbin 14 from coil 3.When formed body 16 is insulator, the heat dissipation characteristics of formed body 16 has the tendency of variation.If the heat dissipation characteristics of this formed body 16 is poor, the heating of coil 3 is accumulated in the inside of formed body 16, and the temperature of coil 3 rises.Therefore, need to improve the heat dissipation characteristics of formed body 16, and the heat of coil 3 is become separated in flight to atmosphere.
The material of formed body 16 is identical with bobbin 14, is to take the moulding material that the metal oxide particle of insulating properties forms in thermoplastic resin as packing material is mixed into.Formed body 16 is by carrying out injection molding forming and manufacture or make to be mixed with the castable that the thermosetting resin of the metal oxide particle of insulating properties flows into the mould 17 (with reference to Fig. 8) of frame-like and manufacture being mixed with the thermoplastic resin of the metal oxide particle of insulating properties.
The kind of the structure of metal oxide particle during injection molding forming formed body 16 and kind, thermoplastic resin and thermal conductivity are identical during with injection molding forming bobbin 14.The structure of metal oxide particle during castable formed body and kind are identical during with injection molding forming bobbin 14.The material of the macromolecular structure of the wire of sclerosis when the thermosetting resin using during castable formed body is softening, cooling while having heating.The mixture of one or more that can select from for example epoxy resin, polyurethane, phenolic resins, urea resin, melmac.
By the thermoplastic resin that is mixed with metal oxide particle of above record being carried out to injection molding forming or carrying out castable to being mixed with the thermosetting resin of metal oxide particle, it is more than 2W/ (mK) can manufacturing thermal conductivity, for example 6W/ (mK), 8W/ (mK), 10W/ (mK) ..., maximum 20W/ (mK) formed body.
In addition, the coefficient of linear expansion of bobbin 14 and formed body 16 (flowing/right angle) is set as 10 * 10
-6above 30 * 10
-6below.The coefficient of linear expansion of bobbin 14 and formed body 16 is than resin (120 * 10
-6) few one of coefficient of linear expansion, approach steel (11～13 * 10
-6), copper (19～20 * 10
-6), aluminium (22～23 * 10
-6) etc. the coefficient of linear expansion of metal.Bobbin 14 owing to can make temperature increase time and the elongation of formed body 16 and coil 3, unshakable in one's determination 11 elongation about equally, so can keep their contact.Therefore, can prevent because temperature rises vacuum gap or air layer between them and the situation that is difficult to heat conduction.
Figure 11 illustrates the stereogram of linear motor of the bar type of the second execution mode of the present invention.The linear motor of this execution mode is the actuator that makes the axle that bar 21 (axle) moves along its axis direction with respect to formed body (housing) 22, for making the moving bodys such as electronic unit along an axially movable situation.For example, in an axle of installing at the chip that the electronic unit of shaped like chips is arranged on to the position of regulation specifically,, use.This linear motor only uses an axle, in order to improve operating efficiency, and also can a plurality of linear motors of permutation and combination and be used as the actuator of multiaxis.
Linear motor, by the magnetic field and the electric current that flows through coil 24 of exciting magnet 23, can obtain for making bar 21 carry out straight-line power.The surrounding of bar 21 is by surrounding along the stacked a plurality of coils 24 of axis direction.In other words, bar 21 connects stacked coil 24.
Figure 12 illustrates the exciting magnet 23 of linear motor and the position relationship of coil 24.In hollow space in bar 21, discoid a plurality of magnet 31 (sector magnet) mutually with homopolarity relatively to mode, the N utmost point extremely relative with the N utmost point, the S utmost point and S to mode stacked as exciting magnet 23.The surrounding of bar 21 is laminated with a plurality of coils 24 of encircles rod 21.A plurality of coils 24 consist of the three-phase coil of U, V, W phase composition.When making three-phase current that phase place is different flow through coil 24 for 120 °, produce the shifting magnetic field of moving along the axis direction of coil 24.Exciting magnet 23 in bar 21 obtains thrust under the effect of shifting magnetic field, with the speed of shifting magnetic field synchronously with respect to the relative rectilinear motion that carries out of coil 24.
As shown in figure 11, the bar 21 of linear motor is supported as moving along the axis direction of bar 21 by formed body 22.Coil unit is kept by coil retainer 25, and described coil unit and coil retainer 25 are covered by formed body 22.
The formed body of the material of formed body 22 and above-mentioned the first execution mode in the same manner, is to take the moulding material that the metal oxide particle of insulating properties forms in thermoplastic resin as packing material is mixed into.Formed body 22 is by carrying out injection molding forming and manufacture being mixed with the thermoplastic resin of the metal oxide particle of insulating properties.Coil 24 and coil retainer 25 are placed on the mould of injection molding forming, by the shaping of inlaying of flow forming material, and on coil 24 and coil retainer 25 integrally formed formed body 22.
The kind of the structure of metal oxide particle during injection molding forming formed body 22 and kind, thermoplastic resin and thermal conductivity are identical during with injection molding forming bobbin 14.By carrying out injection molding forming to being mixed with the thermoplastic resin of metal oxide particle, it is more than 2W/ (mK) can manufacturing thermal conductivity, for example 6W/ (mK), 8W/ (mK), 10W/ (mK) ..., maximum 20W/ (mK) formed body 22.
Figure 13 illustrates the coil unit being kept by coil retainer 25.Coil unit be laminated with a plurality of for example tens by the parts of the helically wound coil 24 of coil of wire.The wire 24a of coil 24 must a connection.For being simplified, uses the distribution of the wire 24a of coil 24 insulated substrate 26.On insulated substrate 26, be formed with the conductive pattern for a plurality of coils 24 that connect up.Conductive pattern by the coil of U phase be connected to each other, the coil of V phase is connected to each other, the coil of W phase is connected to each other and forms.
Figure 14 illustrates the details drawing of the coil retainer 25 of hold-in winding 24.Because adjacent coil 24 need to be insulated from each other, therefore between coil 24, be folded with resinous spacer portion 25b.The front shape of spacer portion 25b and coil 24 similarly forms toroidal.Spacer portion 25b and the tabular retainer main part 25a along the elongated extension of orientation of coil 24 are integrally formed.
About equally, the diameter of transverse width and coil 24 about equally for the length of orientation of the coil 24 of retainer main part 25a and the entire length of coil unit.On the upper surface of retainer main part 25a, insulated substrate 26 is installed.And the side of retainer main part 25a is provided with when injection molding forming for coil retainer 26 being fixed on to the projection 25c (with reference to Figure 13) on mould.Pressure in order to prevent due to injection molding forming and coil retainer 25 produces the situation of positions skew.On the lower surface of retainer main part 25a, be formed with the curved depression 25d that the outer shape with coil 24 matches.As shown in figure 13, coil 24 has wire 24a.For the through hole that wire 24a is imported to insulated substrate 26, and reserve a plurality of distributions on the identical position of the through hole with insulated substrate 26 of retainer main part 25a, use hole.
As shown in figure 14, the front shape of spacer portion 25b and coil 24 similarly forms circular, outstanding downwards from tabular main part 25a.Spacer portion 25b is folded between adjacent whole coil 24, and is arranged on the two ends of coil unit.Therefore, the number of spacer portion 25b is than the number of coil 24 many one.
The bobbin 14 of the material of coil retainer 25 and above-mentioned the first execution mode in the same manner, is to take the moulding material that the metal oxide particle of insulating properties forms in thermoplastic resin as packing material is mixed into.Coil is by carrying out injection molding forming and manufacture being mixed with the thermoplastic resin of the metal oxide particle of insulating properties.
The kind of the structure of metal oxide particle during injection molding forming coil retainer 25 and kind, thermoplastic resin and thermal conductivity are identical during with injection molding forming bobbin 14.By carrying out injection molding forming to being mixed with the thermoplastic resin of metal oxide particle, it is more than 2W/ (mK) can manufacturing thermal conductivity, for example 6W/ (mK), 8W/ (mK), 10W/ (mK) ..., maximum 20W/ (mK) coil retainer 25.
In addition, the coefficient of linear expansion of coil retainer 25 and formed body 22 (flowing/right angle) is set as 10 * 10
-6above 30 * 10
-6below.The coefficient of linear expansion of coil retainer 25 and formed body 22 is than resin (120 * 10
-6) few one of coefficient of linear expansion, approach steel (11～13 * 10
-6), copper (19～20 * 10
-6), aluminium (22～23 * 10
-6) etc. the coefficient of linear expansion of metal.Coil retainer 25 owing to can make temperature increase time and the elongation of formed body 22 and the elongation of coil 24 about equally, so can keep their contact.Therefore, can prevent because temperature rises vacuum gap or air layer between them and the situation that is difficult to heat conduction.In addition, formed body 22 also works as the housing of armature, is processed with for being arranged on the screw thread 22b (with reference to Figure 11) on the other side's parts on formed body 22.Therefore when formed body 22 is arranged on metal the other side's parts such as aluminium, also the elongation of the installing space of the elongation of the installing space of the screw thread 22b of formed body 22 and the other side's parts can be formed about equally, can prevent from producing on formed body 22 excessive power.
In addition, the present invention is not limited to above-mentioned execution mode, and can carry out various changes in the scope that does not change main contents of the present invention.In the execution mode of the linear motor of above-mentioned platypelloid type, armature carries out rectilinear motion with respect to exciting magnet, but can be also that exciting magnet carries out rectilinear motion.In the execution mode of above-mentioned bar Linear motor, bar carries out rectilinear motion with respect to armature, but can be also that armature carries out rectilinear motion.
Embodiment
In the linear motor of platypelloid type, bobbin and formed body are used the moulding material that thermal conductivity is 6W/ (mK).And, measure current value I be changed to * 1 times, * 1.15 times, the temperature of * coil 14 1.63 times time.
Figure 15 illustrates the figure of measurement result.When in figure, (A) represents current value I * 1 times, while (B) representing current value I * 1.15 times, while (C) representing current value I * 1.63 times.In the comparative example of Figure 15, bobbin is used liquid crystal polymer, and formed body is used epoxy resin.
As shown in the inventive example, known by use the material of high thermal conductivity in bobbin and formed body, can suppress the temperature of coil.And as (B) in figure and (C), the temperature (91.2 degree) of the coil of the inventive example when temperature of the coil of comparative example during current value I * 1.15 times (91.5 degree) and current value I * 1.63 times is almost equal.Known in the inventive example, compare with comparative example, can drop into extraly electric current to 1.4 times of 1.63/1.15 ≒.
The Japanese Patent Application 2008-032518 of this specification based on application on February 14th, 2008.Its content is all included in this.
Claims (6)
1. a linear motor, the magnetic field producing by exciting magnet and flow through the electric current of coil, obtains for making coil relatively carry out straight-line thrust with respect to exciting magnet, and it possesses:
The exciting magnet of the N utmost point and S utmost point alternative arrangement on described linear movement direction;
There is iron core, the formed body of a plurality of coils, magnetic, the armature of bobbin, described a plurality of coil across gap relative with described exciting magnet to, the iron core of described magnetic has a plurality of broach that are inserted into respectively in described a plurality of coil, described formed body covers described a plurality of coils and described a plurality of coils is combined with the iron core of described magnetic, described bobbin is folded between each coil and each broach, described iron core, described bobbin, described coil are integrally formed by described formed body
Described formed body is that insulator and its thermal conductivity are more than 2W/ (mK),
Described bobbin is that insulator and its thermal conductivity are more than 2W/ (mK).
2. a linear motor, the magnetic field producing by exciting magnet and flow through the electric current of coil, obtains for making coil relatively carry out straight-line thrust with respect to exciting magnet, and it possesses:
The exciting magnet of the N utmost point and S utmost point alternative arrangement on described linear movement direction;
The armature with a plurality of coils, coil retainer, formed body, described a plurality of coils surround around described exciting magnet, and described coil retainer is used for keeping described a plurality of coil, and described formed body covers described a plurality of coils and described coil retainer,
Described coil retainer is included in the retainer main part that runs through described a plurality of coil on described linear movement direction and extend and is folded in a plurality of spacer portion between adjacent coil,
Described formed body is that insulator and its thermal conductivity are more than 2W/ (mK),
The described retainer main part of described coil retainer and described a plurality of spacer portion are that insulator and its thermal conductivity are more than 2W/ (mK).
3. linear motor according to claim 1 and 2, is characterized in that,
Described bobbin, described coil retainer or described formed body are in resin, to mix a plurality of metal oxide particles with the insulating properties of different average grain diameters to form.
4. linear motor according to claim 3, is characterized in that,
Described bobbin, described coil retainer or described formed body are by carrying out injection molding forming and manufacture being mixed with the thermoplastic resin of the metal oxide particle of described insulating properties.
5. linear motor according to claim 3, is characterized in that,
Described formed body is that the castable that flows into mould by making to be mixed with the thermosetting resin of the metal oxide particle of described insulating properties is manufactured.
6. linear motor according to claim 1 and 2, is characterized in that,
The coefficient of linear expansion of described bobbin, described coil retainer or described formed body is set as 10 * 10
-6above 30 * 10
-6below.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008-032518 | 2008-02-14 | ||
| JP2008032518 | 2008-02-14 | ||
| PCT/JP2009/051081 WO2009101852A1 (en) | 2008-02-14 | 2009-01-23 | Linear motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101939897A CN101939897A (en) | 2011-01-05 |
| CN101939897B true CN101939897B (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200980104631.5A Active CN101939897B (en) | 2008-02-14 | 2009-01-23 | Linear motor |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP5444008B2 (en) |
| CN (1) | CN101939897B (en) |
| DE (1) | DE112009000359T5 (en) |
| TW (1) | TWI482398B (en) |
| WO (1) | WO2009101852A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2013026268A (en) * | 2011-07-15 | 2013-02-04 | Hitachi High-Tech Instruments Co Ltd | Two-axis drive mechanism and die bonder |
| JP5542894B2 (en) * | 2012-10-26 | 2014-07-09 | 三菱電機株式会社 | Stator manufacturing method for rotating electrical machine |
| US10491078B2 (en) * | 2014-03-28 | 2019-11-26 | Fuji Corporation | Linear motor heat dissipation structure |
| TWI558067B (en) | 2015-09-18 | 2016-11-11 | 財團法人工業技術研究院 | Winding frame structure for motors |
| WO2017174966A1 (en) | 2016-04-08 | 2017-10-12 | Renishaw Plc | Coordinate positioning machine |
| DE102016122612A1 (en) * | 2016-11-23 | 2018-05-24 | Kessler energy GmbH | Motor component, primary part and linear motor |
| JP7442469B2 (en) | 2021-01-27 | 2024-03-04 | Ｊｆｅテクノリサーチ株式会社 | Magnet loss measurement system and magnet loss measurement method |
| JP2022116950A (en) * | 2021-01-29 | 2022-08-10 | 日本電産サンキョー株式会社 | actuator |
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| CN101032069A (en) * | 2004-09-30 | 2007-09-05 | Thk株式会社 | Rod-type linear motor |
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| JPH0616239A (en) * | 1992-06-29 | 1994-01-25 | Hitachi Ltd | Magnetically levitated conveyor device |
| JP3355024B2 (en) * | 1994-05-16 | 2002-12-09 | 三菱電機株式会社 | Coil device for AC generator |
| JPH09154272A (en) * | 1995-11-28 | 1997-06-10 | Nippon Seiko Kk | Cooling structure of linear motor |
| JP3428486B2 (en) * | 1999-03-11 | 2003-07-22 | 三菱電機株式会社 | Linear motor |
| JP3643273B2 (en) * | 1999-10-28 | 2005-04-27 | 株式会社ソディック | Linear motor coil device and manufacturing method thereof |
| JP2002044928A (en) * | 2000-07-21 | 2002-02-08 | Sodick Co Ltd | Linear motor |
| JP2002147468A (en) * | 2000-11-10 | 2002-05-22 | Koyo Seiko Co Ltd | Insulation bearing |
| JP2002354780A (en) | 2001-05-24 | 2002-12-06 | Yaskawa Electric Corp | Cylindrical magnetic field liner motor |
| JP2004350419A (en) * | 2003-05-22 | 2004-12-09 | Yaskawa Electric Corp | Linear motor |
| JP4672315B2 (en) | 2004-09-06 | 2011-04-20 | 東芝機械株式会社 | Linear motor and linear moving stage device |
| JP4860222B2 (en) * | 2005-09-28 | 2012-01-25 | Ｔｈｋ株式会社 | Linear motor and manufacturing method thereof |
| JP2007153969A (en) * | 2005-12-02 | 2007-06-21 | Showa Denko Kk | Highly heat-conductive resin composition and substrate for wiring |
| JP5315598B2 (en) | 2006-07-28 | 2013-10-16 | Ｊｆｅスチール株式会社 | Boiler heat transfer tube group traveling device, boiler heat transfer tube wall thickness inspection device and method |
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2009
- 2009-01-23 WO PCT/JP2009/051081 patent/WO2009101852A1/en active Application Filing
- 2009-01-23 DE DE112009000359T patent/DE112009000359T5/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101032069A (en) * | 2004-09-30 | 2007-09-05 | Thk株式会社 | Rod-type linear motor |
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| JP特开2002-147468A 2002.05.22 |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN101939897A (en) | 2011-01-05 |
| JP5444008B2 (en) | 2014-03-19 |
| TWI482398B (en) | 2015-04-21 |
| JPWO2009101852A1 (en) | 2011-06-09 |
| WO2009101852A1 (en) | 2009-08-20 |
| DE112009000359T5 (en) | 2011-01-20 |
| TW200945737A (en) | 2009-11-01 |
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